Check and Validate Any IBAN Number Validate International Bank Account Numbers with country-specific length checks and MOD-97 checksum.

The tool works by first cleaning the input string using the `replace` method to remove any spaces and converting it to uppercase. It then checks if the cleaned string starts with a valid two-letter country code using a regular expression. If valid, it retrieves the corresponding country name from the `COUNTRY_NAMES` object, which is a Record data structure containing country codes as keys and their respective names as values. The tool also uses another Record data structure, `IBAN_LENGTHS`, to store the expected lengths of IBANs for each country.

The validation process involves checking the length of the input string against the expected length for the given country code. If the lengths match, it proceeds to validate the check digits at positions 3-4 using another regular expression. The tool then performs MOD-97 checksum validation by rearranging the input string and calculating the remainder using the `mod97` function, which utilizes a loop to iterate over each character in the string and apply the necessary conversions and calculations according to the ISO 7064 standard.

The `mod97` function uses the `charCodeAt` method to get the ASCII value of each character and subtracts 55 if it's an uppercase letter, effectively converting letters to their corresponding numeric values. The tool also utilizes React hooks such as `useState` and `useCallback` to manage state and handle user input, and it renders the validation results using JSX syntax, including a formatted version of the input IBAN for easy copying. Additionally, the tool uses Framer Motion library to add animations to the UI components, specifically the button that triggers the validation process.

The tool's UI is built using React components such as `InputWithHelp` and `CopyButton`, which are customized with specific props and CSS classes to match the desired design. The `validateIban` function returns an object containing a boolean indicating whether the IBAN is valid and an array of strings providing detailed validation results, including any error messages or warnings. This information is then rendered in the UI using a combination of JavaScript and JSX syntax, allowing users to easily understand the validation outcome and take necessary actions.